Dynamica Ropes develops and manufactures innovative solutions and offshore lifting equipment to the Offshore lifting Oil & Gas Industry.

The R&D department is located in the Headquaters in Denmark and at your disposal if needed in the process of designing Offshore lifting Tethers for mooring of risers, umbilicals and moorings of mid-water arches.

The synthetic Offshore Tethers outperform chain and steel wire as they are light, safe and easy to handle. The low weight and almost neutral buoyancy means that this type of mooring is easy to handle by ROVs in greater water depths.

Dynamica Offshore Tethers – your oppotunities

  • Fiber Roundsling Tethers fitted with woven jackets
  • Rope Tethers with braided jackets/woven jackets
Tether fitting
Tether

Fiber Tethers

Load bearing material    : DM20 HMPE Dyneema or Aramid fibres

Construction                   : ‘endless loop’

Capacity                         : 1 to >3000 t of MBL or more on request

Length                            : 0.8 – 100 m

Length tolerance            : +/- 0.5% or on request

Mud and sand filter        : woven fabric and particle protection

Cover                             : several layers of Dyneema® and DualCordura® jackets

Visibility                          : longitudal reflective line applied along the Tether body

Certification                    : on customer´s request by DNVGL, BV or other

Fiber Tether

Rope Tethers

Load bearing material    : DM20 HMPE

Construction                   : single or multicore

Capacity                          : 1 to >3000 t of MBL or more on request

Length                             : 0.8 – 100m

Length tolerance             : +/- 0.5% or on request

Mud and sand filter         : woven fabric and particle protection

Cover                              : several layers of Dyneema® and DualCordura® jackets

Visibility                           : longitudal reflective line applied along the Tether body

Certification                     : on customer´s request by DNVGL, BV or other

Rope tether6x6

Proof load

We offer the Proof Loading of Tethers up to 500 t in our in-house test bed facility with client representative and  3rd party representative presence if requested. Tethers which require higher proof load are tested at the external test facilities.

Proof loading
Test bed

Load bearing core

Dynamica Tethers are manufactured with DM20 or Aramid fibers. Tethers made with DM20 are the perfect choice for the subsea installation due to the minimal creep in 20-25 years of service.  The DM20 fibres with the specific gravity <1 (floating) can be also designed to be additionally weighted, depending on the R&D and on customer specifications. The Tethers made with Aramids have a specific gravity >1 and slightly larger size/strength ratio comparing with DM20.

For certain applications Rope Tethers are offered as a parallel laid construction with a number of sub-ropes.

Mud and sand filter

Tethers are manufactured with sand- and mud filter on request. Sand- and mud filter barrier is included between the load bearing core and the multiple jacket layers. The core of the Tether is extremely well protected by using this type of barrier, as the mud and sand particles greater than 5 microns are kept away from the load bearing core. At the same time the filter allows free flooding of the Tether with no risk from that the seabed particles can damage the fibers in the core.

Covers and protections

The design of the Tether and the construction of the jackets is always done in a close cooperation with the user. Dynamica Tethers are offered with several layers of jackets and additional heavy duty Dyneema® cover protections on the anchor points.

Covers
Tethers with ROV handles

Reflective cover marker

Dynamica Tethers are fitted with a longitudal reflective marker on the entire length, enabling a high degree of visibility for the ROV operator during installation and ensuring elimination of any – unwished –  twist of the Tether.

Quality offshore lifting equipment

Our entire production process is computer monitored in order to obtain the most balanced products.

We carefully select the DM20 or Aramid fibers used for our Tethers, and we are very cautious with selection of the sub suppliers and monitor the quality of raw materials in accordance with the ISO 9001:2015 Quality Standard

The key stages of the production are documented though the entire manufacturing process, and photos and internal factory documentation is included in a Manufacturer Data Book. We follow carefully all the steps in production and have full traceability on materials used for Tether production in each of the steps.

Each seized or spliced eye or termination is adequately controlled in order to secure the points of attachment of the Tethers to clamps or anchors.

Technical Support when designing your Offshore Tether

The complicated Tether systems are presented to the customers using the latest CAD technology, where the Tether design is explained and which allows to have a product reviewed in the cooperation with the user.

All synthetic Tethers are made up to individual requirements and the most suitable systems are provided, ensuring that the most cost effective solution for the application will be chosen.